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A discussion of benefits to be derived from using testing tools such as JUnit, DUnit, NUnit or CppUnit. The heart of the argument is that such tools encourage programmers to create highly modular, reusable classes that are easy to maintain.

This article contains the explication of a simple programming tip that can be read in a few minutes: Avoid writing code that does anything substantial inside a visual container. Instead, create separate classes for your working code.